Question

For each question, encircle the correct answer.

1) The width of the confidence interval estimate is __________ the margin of error

. A) Equal to

B) Half of

C) Double

D) None of the above.

2) Suppose in all Math117 sections, 10% of the students are left-handed. A sample of 20 students have been randomly selected. The expected number of left-handed students in the sample is

A) 2

B) 5

C) 10

D) 16

3 ) Which of the following is not a property of the normal probability distribution?

A) Unimodal.

B) Skewed.

C) Mean equals median.

D) Bell-shaped distribution.

4 )The sampling error can be

A) Positive

B) Negative

C) Small

D) All the above

.5 ) The uniform distribution has a shape of

A) A bell.

B) An exponential curve.

C) A rectangle.

D) A left-skewed distribution.

Answer 1